I have a netbook Sony Vaio sve-1111, with E2-1800 apu and Ati hd7430 vga.Until some time ago, Sabayon was running smoothly (kernel 3.4.x); now after some time, I decided to reinstall everything from scratches.I have installed the iso of sabayon 13.10 (kde, amd64) from your website. Everything ok. The only problem was with the Ati driver.The free xorg driver gave me high temperatures, so I decided to install the Ati driver following these steps: https://wiki.sabayon.org/index.php?title=HOWTO:_Get_AMD/ATI_or_Nvidia_Video_Cards_working_in_Sabayon

No hints from you guys?I just updated to the last version from sabayon-weekly, but no change at all. As usual, everything seems to work just fine, except the brightness control.I hope someone could give me some suggestions on what to try...

- adding "acpi_osi=Linux acpi_backlight=vendor" to the line GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub and updating grub after it;- also tried to change "acpi_backlight=vendor" with the value "kernel" or "legacy"- also tried to change "acpi_osi=Linux" with the value "!Windows 2012"

I tried all the possible combinations of these and didn't work.

Moreover, I tried playing around with the files in /sys/class/backlight/acpi_video0 , namely echoing a value to the file "brightness", but nothing happens.

Have a look in the sub-directories in /sys to see if you can find any files relating to backlight brightness. Depending on the laptop, these could be anything from /sys/class/backlight/intel_backlight/brightness to /sys/devices/platform/sony-laptop/kbd_backlight/brightness to /sys/class/backlight/sony/brightness and so on. If you can find the appropriate file in the kernel file system, you can then echo different values into it in order to vary the brightness. And that could be automated with a Bash script and bound to key shortcuts.